Issue #1975150 follow-up by David_Rothstein: Fix wrongly named return value in shortcut documentation.

core/modules/shortcut/shortcut.api.php

@@ -33,7 +33,7 @@
 function hook_shortcut_default_set($account) {
   // Use a special set of default shortcuts for administrators only.
   if (in_array(config('user.settings')->get('admin_role'), $account->roles)) {
-    return 'mymodule_shortcut_admin_default_set';
+    return 'admin-shortcuts';
   }
 }